Final9A_S09_YU

# Final9A_S09_YU - 1 2 3 4 5 6 7 8 9 Total Please do not...

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Final Exam: Physics 9A Section A, Spring 2009 Name _______________________________ ID# _______________________________ Note: Closed book and closed notes. Calculators are allowed. No credit will be given without all work being shown. Constants: g = 9.80 m/s 2 . [1] A 30.0-kg antelope starts from rest and covers a distance of 50.0 m in 10.0 s. Assume constant acceleration. (a) (8 pts) What is its acceleration? (b) (6 pts) What is its final speed? (c) (6 pts) What is the net force on the antelope? 1 2 3 4 5 6 7 8 9 Total Please do not write above this line.

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[2] Two rocks, each of mass 0.5 kg, are thrown off a building with the same speed, 20.00 m/s. One is thrown at an angle of 45° above the horizontal, and one is thrown 45° below the horizontal. You are interested in their speeds just before they strike the ground, 18.0 meters below. (a) (10 pts) A physics 9 student claims that the one thrown downward will have the greatest speed. Argue for or against her claim by computing the speed in each case. (b) (5 pts) She next claims that both rocks will travel the same horizontal distance before hitting the ground. Argue for or against her claim by computing the horizontal distance in each case. (c) (5 pts) Draw a free body diagram and find the net force for the upward-thrown rock just after the rock leaves the student's hand. Ignore air friction.
[3] You take your cousin ( M = 25.0 kg) for a ride in a sled ( m = 10.0 kg).

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